Adding release date

Hello everyone, I added a page for the miniseries I worked on. Sadly there were some issues with the release and it took longer then expected. When I first added the page it was possible to rate the series, but as soon as the original release date arrived (that was 3-4 months ago). Now that the project is finally released it seems that IMDb has taken out the original release date (which for itself is no problem) but when I try to add the new and actual release date I cannot. I read through the guidelines and instructions but apparently there should not only be the "change/delete" button but also a button to add a release date. That one does not appear when I try it. Has someone had a similar problem or knows how to fix that? Or maybe know an E-Mail of the technical support I can address? Any help would be much appreciated.